<I>Ammannia</I> (<I>Lythraceae</I>) in Malesia
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Blumea 59, 2014: 11–18 www.ingentaconnect.com/content/nhn/blumea RESEARCH ARTICLE http://dx.doi.org/10.3767/000651914X681676 Ammannia (Lythraceae) in Malesia W.J.J.O. de Wilde1, B.E.E. Duyfjes1 Key words Abstract Enumeration and taxonomic treatment of the seven species of Ammannia (Lythraceae) occurring in the Malesian area are presented among which one new species A. herbacea. A key to the species is given. Two Ammannia species are illustrated. Ammannia debilis is a distinct species endemic to S India. Lythraceae Malesia Published on 24 April 2014 new species INTRODUCTION Cryptotheca Blume (1826) 1128; (1856) 9. — Ammannia L. subg. Cryptotheca (Blume) Koehne (1880) 262. — Lectotype (Blume 1856): Cryptotheca Ammannia L. is a genus of mostly annual, often weedy small- dichotoma Blume = Ammannia dichotoma (Blume) S.G.Panigrahi. flowered herbs of wet situations often confused with Rotala L. Diplostemon (Wight & Arn.) Miq. (1856) 615. — Ammannia sect. Diploste mon (‘Dyplostemonae’) DC. (1828) 80. — Ammannia subg. Diplostemon Since Graham et al. (2011) Ammannia is considered to include Wight & Arn. (1834) 304. — Lectotype (Wight & Arnott 1834): Ammannia the rather large genus Nesaea Kunth (Africa, Asia, America) octandra L.f. and at present it may comprise about 75 species in subtropical Ammannella Miq. (1856) 618. — Type: Ammannella linearis Miq. = Amman and tropical areas all over the world. nia octandra L.f. In Malesia few species occur, only seven, of which Ammannia Hapalocarpum (Wight & Arn.) Miq. (1856) 618. — Ammannia subg. Hapalo coccinea is presumably an early introduction. Ammannia carpum Wight & Arn. (1834) 305. — Lectotype (here designated): Amman nia vesicatoria Roxb. auriculata is a very widespread, variable species of uncertain circumscription, A. uniflora a local montane endemic deviating Annual (or biennial), mostly erect herbs of open wet places, in several respects from the general facies of Ammannia, and glabrous (calyx glabrous or hairy), branches ± quadrangular. Ammannia herbacea is here newly described based on a single Leaves decussate, sessile, 1-nerved. Inflorescences dicha- collection from E Java. sial, (1–)3–many-flowered, sessile or peduncled; bracteoles The material studied, mostly that in L, appears to consist of 2, minute. Flowers actinomorphic, 4(–6)-merous, calyx tube mainly pre-war collections, illustrating the amazing lack of (hypanthium) campanulate or urceolate, 4–8-nerved, epicalyx- modern collections of inconspicuous herbs. like appendages obvious, or minute or absent, sepals (calyx The now synonymous genus Cryptotheca Blume (1826) was lobes) short; petals absent or small, fugacious; stamens 4(–8), described with two species, based mainly on two quite distinct inserted in the lower half of the calyx tube, episepalous, included characters, namely the presence of only two stamens and a or exserted; ovary incompletely (1–)2–4(–5)-locular, placen- unilocular ovary with one parietal placenta. Later on it was more tas axile (but because of thin incomplete septa in fruit mostly closely defined (Blume 1856), and one of the original two spe- showing up as central), in A. dichotoma perietal; style shorter cies, Cryptotheca apetala (at present a synonym of Ammannia or longer than ovary; disc absent. Capsule (sub)globose, baccifera) was excluded, leaving Cryptotheca monotypic with thin-walled, not transversely striate, irregularly transversely the only species C. dichotoma Blume as lecto type. rupturing. Seeds numerous, concave-convex, angular, 0.3–0.5 mm long. Koehne (1880, 1903) accepted Cryptotheca as a subgenus in Ammannia (subg. Cryptotheca), but erroneously considered the species name C. dichotoma as a synonym of Ammannia micro KEY TO THE MALESIAN SPECIES carpa DC. (1826) which is at present regarded as a synonym of A. auriculata, see below. The combination of Cryptotheca 1. Inflorescence 1-flowered. Stem decumbent, rooting at the dichotoma in Ammannia was made by Panigrahi (1979, ‘1976’) nodes. — Plants from montane areas in E New Guinea .. who also noted that A. microcarpa in its original sense cannot ....................................7. A. uniflora be identical with it. 1. Inflorescence (1–)several or many-flowered. Stem erect, not rooting at the nodes. — Plants from lowland or montane areas . 2 Ammannia 2. Leaf base attenuate. Inflorescences congested, (sub)sessile. Ammannia L. (1753) 119; S.A.Graham (1985) 402; (2007) 236. — Lectotype Petals absent. Stamens 4 . 2. A. baccifera (Britton & Brown 1913): A. latifolia L. 2. Leaf base (broadly) rounded or cordate. Inflorescences (con- Nesaea Comm. ex Kunth (1823) 151; S.A.Graham (2007) 240. — Type: gested or) open, subsessile or short-pedunculate. Petals Nesaea triflora (L.f.) Kunth. present (sometimes minute and early deciduous). Stamens 4–8 . .3 1 Naturalis Biodiversity Center, section Botany, P.O. Box 9517, 2300 RA Leiden, The Nether lands; 3. Flowers small, calyx (calyx tube) (0.5–)1–2 mm long ... 4 corresponding author e-mail: [email protected]. 3. Flowers larger, calyx (calyx tube) (2.5–)3–5 mm long . 6 © 2014 Naturalis Biodiversity Center You are free to share - to copy, distribute and transmit the work, under the following conditions: Attribution: You must attribute the work in the manner specified by the author or licensor (but not in any way that suggests that they endorse you or your use of the work). Non-commercial: You may not use this work for commercial purposes. No derivative works: You may not alter, transform, or build upon this work. For any reuse or distribution, you must make clear to others the license terms of this work, which can be found at http://creativecommons.org/licenses/by-nc-nd/3.0/legalcode. Any of the above conditions can be waived if you get permission from the copyright holder. Nothing in this license impairs or restricts the author’s moral rights. 12 Blumea – Volume 59 / 1, 2014 b c 1 mm 0.5 mm e d 1 mm 0.5 mm 2 cm a Fig. 1 Ammannia baccifera L. a. Habit of apex of stout plant; b. flower; c. pistil; d. fruit within persistent calyx; e. seed, two views. — Reproduced with permis- sion from Soerjani et al. (1987). W.J.J.O. de Wilde & B.E.E. Duyfjes: Ammannia in Malesia 13 4. Stamens 2. Placenta single, parietal .... 4. A. dichotoma a very closely related widespread species) beside a second 4. Stamens 4(–8). Placentas axile (septa incomplete, and in name A. multiflora (for a widespread closely related species fruit showing up as central) . .5 as well) is employed in Qin & Graham (2007) for China and 5. Plant with many branches in upper part. Inflorescences by Hewson (1990) for Australia. Unfortunately, collections of (1–)4–10(–18) mm pedunculate. Style as long as or longer this complex for the Malesian area are too limited to allow for than ovary . .1. A. auriculata a well-founded opinion on whether one or two species should 5. Plant with few branches at base. Inflorescence c. 0.5 mm be accepted. Verdcourt (1994) for E Africa, used the name pedunculate. Style shorter than ovary .... 5. A. herbacea A. auriculata for a very variable widespread species, but he did not mention A. multiflora described for Asia as a synonym. 6. Calyx (calyx tube) sharply 4-angled. Stamens 8 . ...................................6. A. octandra The epithet ‘microcarpa’ could raise the suspicion that De Can- 6. Calyx (calyx tube) low-ridged but not conspicuously angular dolle (1826) had the species at present named A. dichotoma or ridged. Stamens 4(–7)...............3. A. coccinea (also occurring in Timor) in mind, namely a plant with small flowers and small fruit indeed, but the description does not match it. De Candolle described a plant from Timor with leaves 1. Ammannia auriculata Willd. cordate at base, flowers without petals, with 4 stamens, the Ammannia auriculata Willd. (1803) pl. 7; Koehne (1903) 45, f. 5: B; capsule about as long as the calyx, and with a central placenta. S.A.Graham (1985) 403; Hewson (1990) 99, f. 32: D–F; Verdc. (1994) 37; Although the alleged type specimen G-00454022 (G-DC) be- P.H.Hô (1992) 31, f. 3680; H.N.Qin & S.A.Graham (2007) 276; H.N.Qin longs to A. dichotoma, the specimen described by De Candolle et al. (2008) f. 292: 5–7. — Type: Unknown collector BW 3081 (holo B, is still unknown, but obviously concerns A. multiflora, which is barcode B-W 03081-01 0), Egypt (see also Graham 1985). in our present paper regarded a synonym of the widespread Ammannia multiflora Roxb. (1820) 447; Koehne (1903) 48; Backer (1930) 465; (1964) 253; (1973) pl. 440. — Type: Roxburgh s.n. (iso K, barcode polymorphic A. auriculata. K000729678, right-hand specimen), East India (see also Panigrahi 1979, Ammannia debilis was described by Aiton (1789) from plants ‘1976’: 186). cultivated in Kew, introduced by Banks from East India. The de- Ammannia microcrpa DC. (1826) 93; (1828) 78. — Type: Unknown collector, scription mentions leaves narrowed at the base (as in A. bacci ‘Timor’, see note. fera) and petals present (as in A. multiflora, here treated as Ammannia debilis auct. non Aiton: Moritzi (1846) 12. — Ditheca debilis (Aiton) Miq. (1856) 615, p.p., based on misidentification of Zollinger specimens a synonym of A. auriculata). Moritzi (1846) cited A. debilis, from Java, not seen, see note. a misidentification of a Zollinger collection, for Java; Miquel (1856) accepted Ditheca debilis (based on A. debilis) for Java Erect, annual, glabrous herb, 40–60 cm tall, much-branched in without having seen specimens; Clarke (1879) placed A. debilis upper part; stem 4-angular, not winged. Leaves sessile; lamina in the synonymy of A. baccifera; and Koehne (1903) mentioned narrowly elliptic or lanceolate, (0.5–)1.5–8 by 0.2–0.8(–1.2) A. debilis with a question mark under A. multiflora. Specimens cm, base broadened, broadly rounded or shallowly cordate, collected by Rottler and named A.